... process: sand casting condition: fully machined test: dynamic testing machine brake disc1) materials: grey iron, ductile iron, stainless steel, carbon ... ,normal lathe,line cutter etc.6) testing equipment(foundy used):elongation tester,hardness tester,metallographic microscope,spectrometer,PC thermometer,CE NSP-550CS ... :+86-411-83704610contact: Angela Li New Fully machined steel brake disc foundry